When a metallic surface is illuminated with radiation of wavelength $\lambda$, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2$\lambda$, the stopping potential is $\frac{V}{4}$ .The threshold wavelength for metallic surface is: (a) 5$\lambda$                (b)$\frac{5}{2}$$\lambda$ (c) 3$\lambda$                (d) 4$\lambda$

Subtopic:  Photoelectric Effect: Experiment |
65%
From NCERT
NEET - 2016
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

An electron of mass m and a photon have the same energy E. Find the ratio of de-Broglie wavelength associated with the electron to that associated with the photon. (c is the velocity of light)

$1.$ ${\left(\frac{E}{2m}\right)}^{1/2}$

$2.$ $c{\left(2mE\right)}^{1/2}$

$3.$ $\frac{1}{c}{\left(\frac{2m}{E}\right)}^{1/2}$

$4.$ $\frac{1}{c}{\left(\frac{E}{2m}\right)}^{1/2}$

Subtopic:  De-broglie Wavelength |
59%
From NCERT
NEET - 2016
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (c=velocity of light)

1. E/c

2. 2E/c

3. 2E/c2

4. E/c2

Subtopic:  Particle Nature of Light |
59%
NEET - 2015
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

A certain metallic surface is illuminated with monochromatic light of wavelength λ. The stopping potential for photoelectric current for this light is 3Vo. If the same surface is illuminated with light of wavelength 2λ, the stopping potential is Vo. The photoelectric effect's threshold wavelength for this surface is?

1. 6λ

2. 4λ

3. λ/4

4. λ/6

Subtopic:  Einstein's Photoelectric Equation |
77%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Which of the following figures represents the variation of the particle momentum and the associated de-Broglie wavelength?

 1 2 3 4
Subtopic:  De-broglie Wavelength |
85%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A photoelectric surface is illuminated successively by monochromatic light of wavelengths λ and λ/2. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material will be:
(h = Planck’s constant, c = speed of light)

1. hc/2λ

2. hc/λ

3. 2hc/λ

4. hc/3λ

Subtopic:  Einstein's Photoelectric Equation |
71%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Light with a wavelength of 500 nm is incident on a metal with a work function of 2.28 eV. The de Broglie wavelength of the emitted electron will be:
1. $$<2.8 \times 10^{-10} \mathrm{~m}$$
2. $$<2.8 \times 10^{-9} \mathrm{~m}$$
3. $$\geq 2.8 \times 10^{-9} \mathrm{~m}$$
4. $$<2.8 \times 10^{-12} \mathrm{~m}$$

Subtopic:  De-broglie Wavelength |
60%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Light with an energy flux of $$25\times 10^{4}~\text{Wm}^{-2}$$ falls on a perfectly reflecting surface at normal incidence. If the surface area is $$15~\text{m}^2$$, then the average force exerted on the surface is:
1. $$1.25\times 10^{-6}~\text{N}$$
2. $$2.5\times 10^{-6}~\text{N}$$
3. $$1.2\times 10^{-6}~\text{N}$$
4. $$3.0\times 10^{-6}~\text{N}$$

Subtopic:  Particle Nature of Light |
62%
NEET - 2014
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increases from 0.5 eV to 0.8 eV. The work function of the metal will be:
1. 0.65 eV

2. 1.0 eV

3. 1.3 eV

4. 1.5 eV

Subtopic:  Einstein's Photoelectric Equation |
67%
From NCERT
NEET - 2014
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

What will be the percentage change in the de-Broglie wavelength of the particle if the kinetic energy of the particle is increased to 16 times its previous value?
1. 25
2. 75
3. 60
4. 50

Subtopic:  De-broglie Wavelength |
69%
From NCERT
NEET - 2014
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints